According to a proposal from PNPI, exotic halo nuclei, such
as 6He, 8He,11Li, are studied at GSI by the method of proton
elastic scattering in inverse kinematics. Secondary ion beams from the fragment separator FRS
at the GSI heavy-ion synchrotron SIS are scattered in the hydrogen-filled ionization chamber
IKAR which serves simultaneously as a gas target and a detector of recoil protons.
The scattering angle of the projectile is also measured by multiple wire proportional
chambers. In this way, the differential cross sections for proton elastic scattering from
exotic nuclei are measured at small momentum transfers. The measured cross sections allow
one to obtain information on the nuclear matter distributions. By present, the differential
cross sections for proton scattering on
6He, 8He, 6Li, 8Li, 9Li, 11Li, 11Be, 12Be, 14Be and 8Be
have been measured.
The results obtained on the nuclear matter density distributions represent a clear signature of nucleon halos
(skins) in 6He, 8He, 11Li, 12Be and 14Be.
Measurements of proton scattering on neutron rich B and C isotopes are planned.
(For more detail review see articles "Study of Nuclear Matter Distribution in Neutron-Rich He and Li Isotopes" in PNPI HEPD Report "Main Scientific Activities 1997-2001"
and
"EXPERIMENTAL STUDY OF THE NUCLEAR SPATIAL STRUCTURE OF NEUTRON-RICH He AND Li ISOTOPES" in PNPI HEPD Report
in PNPI HEPD Report
"
Main Scientific Activities 2002-2006" - pages 173-183).
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